oldchev

In adjusting the Daul WCFB Carbs on this '56, I have had some tell me that I should not adjust the Idle Air By-pass screws just leave them turned all the way in and only adjust the idle mixture screws to achieve idle quality. What say you, is there an "old saws" way of doing it or should I "do it by the book".
Thanks,
Dave.

CJS

On my stock 58 270 hp carbs it works best to start out with the idle air screws all out 1 1/2 turns. Then set the rpm's at the throttle linkage, I use both front and rear carbs evenly. Then go back to the air screws and adjust them one by one for best,strongest, hightest idle. You have to fiddle with it some.

JohnZ

Just sent you a PM.

JohnZ

'56 carbs were different - they had an idle air bypass system (with no idle speed screw) in addition to the idle mixture adjusting screws; dealers were supposed to convert all 56's to eliminate the air bypass system.

oldchev

Yeh, these '56 carbs have that idle air by-pass screw on the same side as the thottle levers down at the throttle body plate as well as the idle mixture adjusting screws in the front of each carb. In doing my reading it seemed to me to be a redundant system. Although in miniscule increments it might have some advantage. But knowing the social/cultural environs of most auto repair shops of the day i figured that the system would be by-passed or eliminated if it wasn't needed.
Thanks for the replies. It is always good to get other peoples opinions especially when you are working alone on some new things.

Dave.